:root{
  --gradient: linear-gradient(90deg, #3558F2 0%, #7B4EF1 50%, #B84DDA 100%);
  --blue:#2980FE;
  --blue-dark:#1768E8;
  --text:#1f2937;
  --muted:#65758b;
  --light:#f6f8fc;
  --line:#e6ebf2;
  --panel:#ffffff;
  --soft:#eef5ff;
  --radius:24px;
  --shadow:0 18px 45px rgba(30,64,175,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#fff;color:var(--text);line-height:1.75;font-size:16px}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.container{width:min(1120px,calc(100% - 32px));margin:0 auto}
.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid rgba(230,235,242,.9)}
.nav-wrap{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:#15203a}
.logo{width:42px;height:42px;border-radius:12px;object-fit:cover;box-shadow:0 8px 20px rgba(41,128,254,.18)}
.site-nav{display:none;position:absolute;top:72px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:12px 16px;box-shadow:0 18px 35px rgba(15,23,42,.08)}
.site-nav.open{display:grid;gap:4px}
.site-nav a{padding:11px 12px;border-radius:14px;color:#475569;font-size:15px}
.site-nav a.active,.site-nav a:hover{background:var(--soft);color:var(--blue)}
.nav-toggle{border:1px solid var(--line);background:#fff;border-radius:14px;padding:9px 14px;color:#1f2937;font-weight:700}
.download-btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 24px;border-radius:999px;background:var(--blue);color:#fff!important;font-weight:800;box-shadow:0 14px 24px rgba(41,128,254,.24);transition:background .2s ease,transform .2s ease,box-shadow .2s ease}
.download-btn:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 18px 30px rgba(23,104,232,.28)}
.text-link{display:inline-flex;align-items:center;color:var(--blue);font-weight:800;margin-top:8px}
.text-link:after{content:"→";margin-left:6px}
.hero-gradient,.cta-section{background:var(--gradient);color:#fff;position:relative;overflow:hidden}
.hero-gradient:before,.cta-section:before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 18% 18%,rgba(255,255,255,.28),transparent 24%),radial-gradient(circle at 78% 38%,rgba(255,255,255,.18),transparent 28%);opacity:.9}
.vpn-network-hero .container{position:relative;z-index:1;display:grid;gap:34px;padding:62px 0 48px}
.hero-copy h1{font-size:clamp(34px,9vw,62px);line-height:1.08;margin:0 0 18px;letter-spacing:-.03em}
.hero-copy p{margin:0 0 24px;color:rgba(255,255,255,.88);font-size:17px;max-width:680px}
.hero-tags,.status-tags,.mini-tags{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 0}
.hero-tags span,.status-tags span,.mini-tags span{border:1px solid rgba(255,255,255,.24);background:rgba(255,255,255,.14);color:#fff;padding:8px 12px;border-radius:999px;font-size:13px;font-weight:700}
.hero-visual{position:relative;min-height:330px;display:grid;place-items:center}
.network-orbit{position:absolute;inset:5% 2%;border:1px solid rgba(255,255,255,.2);border-radius:42px;background:linear-gradient(135deg,rgba(255,255,255,.16),rgba(255,255,255,.05))}
.network-orbit:before,.network-orbit:after{content:"";position:absolute;border-radius:999px;background:rgba(255,255,255,.72);box-shadow:80px 50px 0 rgba(255,255,255,.35),170px 120px 0 rgba(255,255,255,.3),260px 42px 0 rgba(255,255,255,.28)}
.network-orbit:before{width:8px;height:8px;top:60px;left:58px}.network-orbit:after{width:6px;height:6px;right:90px;bottom:70px}
.hero-visual img{position:relative;z-index:2;width:min(86%,430px);filter:drop-shadow(0 28px 38px rgba(18,24,59,.25))}
.float-card{position:absolute;z-index:3;background:rgba(255,255,255,.94);color:#1f2937;border-radius:18px;padding:12px 14px;box-shadow:0 16px 30px rgba(15,23,42,.16);font-weight:800;font-size:14px;border:1px solid rgba(255,255,255,.7)}
.float-card small{display:block;color:#64748b;font-weight:700;font-size:12px}.card-a{left:8px;top:48px}.card-b{right:8px;top:118px}.card-c{left:30px;bottom:52px}.card-d{right:22px;bottom:24px}
.section{padding:68px 0}.section.soft{background:var(--light)}
.section-head{max-width:760px;margin:0 auto 30px;text-align:center}.section-head.left{text-align:left;margin-left:0}.section-head h2{font-size:clamp(26px,5vw,40px);line-height:1.18;margin:0 0 12px;color:#111827}.section-head p{margin:0;color:var(--muted)}
.node-overview{display:grid;grid-template-columns:1fr;gap:16px;margin-top:-28px;position:relative;z-index:4}.node-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:var(--shadow)}.node-card .tag{display:inline-flex;border-radius:999px;background:var(--soft);color:var(--blue);padding:5px 10px;font-size:12px;font-weight:800;margin-bottom:10px}.node-card h3{margin:0 0 8px;font-size:20px}.node-card p{margin:0;color:var(--muted)}
.split-section{display:grid;gap:28px;align-items:center}.image-panel{background:#fff;border:1px solid var(--line);border-radius:32px;padding:18px;box-shadow:var(--shadow);overflow:hidden}.image-panel img{border-radius:24px;margin:auto}.feature-list{display:grid;gap:12px;margin:18px 0}.feature-list div{background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px 16px}.feature-list strong{display:block;color:#16213f}.feature-list span{color:var(--muted);font-size:14px}
.global-nodes-section{background:linear-gradient(180deg,#f7faff 0%,#fff 100%)}.map-panel{position:relative;border-radius:32px;border:1px solid var(--line);background:#fff;box-shadow:var(--shadow);padding:24px;overflow:hidden}.map-panel:before{content:"";position:absolute;inset:18px;background:radial-gradient(circle at 25% 35%,rgba(41,128,254,.22),transparent 10%),radial-gradient(circle at 62% 40%,rgba(123,78,241,.18),transparent 10%),radial-gradient(circle at 48% 70%,rgba(184,77,218,.14),transparent 10%);border-radius:28px}.map-panel img{position:relative;z-index:2;margin:auto}.node-lines{position:absolute;inset:0;background:linear-gradient(120deg,transparent 34%,rgba(41,128,254,.16) 35%,transparent 36%),linear-gradient(25deg,transparent 52%,rgba(123,78,241,.14) 53%,transparent 54%)}
.speed-cards{display:grid;gap:14px}.speed-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:18px}.speed-card b{display:block;color:#111827}.speed-meter{height:10px;border-radius:999px;background:#e8efff;margin-top:12px;overflow:hidden}.speed-meter span{display:block;height:100%;width:70%;border-radius:999px;background:var(--blue)}
.privacy-panel{background:#fff;border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow)}.privacy-panel ul{padding-left:20px;margin:14px 0 0;color:var(--muted)}.privacy-shield{display:grid;gap:12px}.shield-item{background:var(--soft);border:1px solid #dce9ff;border-radius:18px;padding:16px}.shield-item strong{display:block;color:#1f3f88}.shield-item span{color:var(--muted);font-size:14px}
.three-grid,.risk-grid,.faq-grid,.related-grid,.guide-cards{display:grid;grid-template-columns:1fr;gap:16px}.info-card,.risk-card,.faq-item,.guide-card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 28px rgba(15,23,42,.05)}.info-card h3,.risk-card h3,.faq-item h3,.guide-card h3{margin:0 0 8px;color:#111827}.info-card p,.risk-card p,.faq-item p,.guide-card p{margin:0;color:var(--muted)}.risk-card{border-left:4px solid var(--blue)}.risk-card .suggest{margin-top:10px;color:#334155;font-weight:700}
.device-row{display:grid;gap:14px}.device-pill{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}.device-icon{width:38px;height:38px;border-radius:14px;background:var(--soft);display:grid;place-items:center;color:var(--blue);font-weight:900}
.tech-panel{background:#fff;border:1px solid var(--line);border-radius:28px;box-shadow:var(--shadow);padding:20px}.tech-row{display:grid;gap:12px}.tech-block{border:1px solid var(--line);border-radius:18px;padding:16px;background:#fbfdff}.tech-block strong{display:block;color:#16213f}.tech-block span{color:var(--muted);font-size:14px}
.process-steps{display:grid;gap:14px;counter-reset:step}.step-card{position:relative;background:#fff;border:1px solid var(--line);border-radius:22px;padding:22px 22px 22px 64px}.step-card:before{counter-increment:step;content:counter(step);position:absolute;left:20px;top:22px;width:30px;height:30px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900}.step-card h3{margin:0 0 6px}.step-card p{margin:0;color:var(--muted)}
.cta-section{border-radius:34px;margin:58px auto;padding:42px 22px;text-align:center}.cta-section .container{position:relative;z-index:1}.cta-section h2{font-size:clamp(26px,5vw,42px);line-height:1.2;margin:0 0 12px}.cta-section p{margin:0 auto 22px;color:rgba(255,255,255,.86);max-width:680px}
.page-hero{background:linear-gradient(180deg,#f6f9ff 0%,#fff 100%);padding:54px 0 34px;border-bottom:1px solid var(--line)}.page-hero-inner{display:grid;gap:22px;align-items:center}.badge{display:inline-flex;align-items:center;width:max-content;background:var(--soft);color:var(--blue);border:1px solid #dbeafe;padding:6px 12px;border-radius:999px;font-weight:900;font-size:13px}.page-hero h1{font-size:clamp(30px,7vw,48px);line-height:1.12;margin:14px 0 12px;color:#111827}.page-hero p{margin:0;color:var(--muted);font-size:17px;max-width:760px}.page-layout{display:grid;gap:22px;padding:52px 0}.article-panel{background:#fff;border:1px solid var(--line);border-radius:28px;padding:24px;box-shadow:var(--shadow)}.article-panel p{color:#4b5563}.article-panel h2{margin-top:0}.side-panel{background:#f8fbff;border:1px solid var(--line);border-radius:24px;padding:22px;height:max-content}.side-panel h2{font-size:20px;margin:0 0 12px}.check-list{display:grid;gap:10px;margin:18px 0}.check-list li{background:#fff;border:1px solid var(--line);border-radius:16px;padding:12px 14px;color:#475569}.download-zone{margin-top:24px}.download-page .article-panel{text-align:center}.download-steps{counter-reset:down;display:grid;gap:12px;text-align:left;margin:26px 0}.download-steps li{list-style:none;counter-increment:down;background:#fff;border:1px solid var(--line);border-radius:18px;padding:14px 16px 14px 52px;position:relative}.download-steps li:before{content:counter(down);position:absolute;left:16px;top:14px;width:26px;height:26px;border-radius:50%;background:var(--blue);color:#fff;display:grid;place-items:center;font-weight:900}.faq-list{display:grid;gap:16px}.faq-list details{background:#fff;border:1px solid var(--line);border-radius:20px;padding:18px 20px}.faq-list summary{cursor:pointer;font-weight:900;color:#111827}.faq-list p{color:var(--muted);margin:12px 0 0}.site-footer{background:#182034;color:#d7deeb;padding:52px 0 0}.footer-grid{display:grid;gap:26px}.footer-brand{display:flex;align-items:center;gap:10px;font-weight:900;color:#fff;font-size:20px}.footer-brand img{width:36px;height:36px;border-radius:10px}.site-footer p{color:#aeb9cc;margin-bottom:0}.site-footer h3{color:#fff;margin:0 0 12px;font-size:16px}.site-footer a{display:block;color:#aeb9cc;margin:7px 0}.site-footer a:hover{color:#fff}.footer-bottom{text-align:center;border-top:1px solid rgba(255,255,255,.1);margin-top:36px;padding:18px;color:#97a4b8;font-size:14px}
@media (min-width:640px){.node-overview,.three-grid,.risk-grid,.faq-grid,.related-grid,.guide-cards{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(2,1fr)}.page-hero-inner{grid-template-columns:1.3fr .7fr}}
@media (min-width:900px){.nav-toggle{display:none}.site-nav{display:flex;position:static;background:transparent;border:0;box-shadow:none;padding:0;align-items:center;gap:4px}.site-nav a{font-size:14px}.vpn-network-hero .container{grid-template-columns:1.05fr .95fr;align-items:center;padding:82px 0 74px}.node-overview{grid-template-columns:repeat(4,1fr)}.split-section{grid-template-columns:1fr 1fr}.split-section.reverse .image-panel{order:2}.three-grid{grid-template-columns:repeat(3,1fr)}.risk-grid{grid-template-columns:repeat(3,1fr)}.faq-grid{grid-template-columns:repeat(2,1fr)}.process-steps{grid-template-columns:repeat(3,1fr)}.page-layout{grid-template-columns:minmax(0,1fr) 320px}.article-panel{padding:34px}.footer-grid{grid-template-columns:1.4fr .8fr .8fr .8fr}.device-row{grid-template-columns:repeat(3,1fr)}}
@media (min-width:1100px){.hero-copy p{font-size:18px}.section{padding:86px 0}.process-steps{grid-template-columns:repeat(6,1fr)}.step-card{padding:20px}.step-card:before{position:static;margin-bottom:12px}.card-a{left:34px}.card-b{right:28px}.card-c{left:78px}.card-d{right:70px}}